Originally Posted by Mike@N54Tuning.com
The JB4 N55 ISO will make a lot more power and has a lot more features. Not to mention costs a lot less.
Thansk mike. I already know. My very first tune was the JB, I went from the jb3 stage 1 to the stage 2.
Current: 2013 335i 6mt msport
BMS Clutch Stop, JB4, Slightly Modified OEM Muffler
Past: 2011 335i coupe
369 whp/444 torque. (Procede
, Custom Turboback Exhaust, BMS Intake, ER FMIC)